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SubjectRe: [PATCH v4 02/11] drm/bridge: dw-hdmi: add max bpc connector property
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Hi Jernej,

On 17/02/2020 07:38, Jernej Škrabec wrote:
> Hi!
>
> Dne četrtek, 06. februar 2020 ob 20:18:25 CET je Neil Armstrong napisal(a):
>> From: Jonas Karlman <jonas@kwiboo.se>
>>
>> Add the max_bpc property to the dw-hdmi connector to prepare support
>> for 10, 12 & 16bit output support.
>>
>> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index
>> 9e0927d22db6..051001f77dd4 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -2406,6 +2406,10 @@ static int dw_hdmi_bridge_attach(struct drm_bridge
>> *bridge) DRM_MODE_CONNECTOR_HDMIA,
>> hdmi->ddc);
>>
>> + drm_atomic_helper_connector_reset(connector);
>
> Why is this reset needed?

I assume it's to allocate a new connector state to attach a the bpc propery.

But indeed, this helper is never used here, but only as callback to the drm_connector_funcs->reset.

But, amdgpu calls :
/*
* Some of the properties below require access to state, like bpc.
* Allocate some default initial connector state with our reset helper.
*/
if (aconnector->base.funcs->reset)
aconnector->base.funcs->reset(&aconnector->base);

which is the same.

Neil

>
> Best regards,
> Jernej
>
>> +
>> + drm_connector_attach_max_bpc_property(connector, 8, 16);
>> +
>> if (hdmi->version >= 0x200a && hdmi->plat_data->use_drm_infoframe)
>> drm_object_attach_property(&connector->base,
>> connector->dev-
>> mode_config.hdr_output_metadata_property, 0);
>
>
>
>

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